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The paper describes a family of highly-optimized implementations of the Fast SHA-256 cryptographic hash algorithm, which provide industry leading performance on a range of Intel Processors for a single data buffer consisting of an arbitrary number of data blocks. The paper describes the overall design of the Fast SHA-256 software, delves into some of the detailed optimizations, and presents a summary of the performance of some versions of the code. With the authors' implementation a single core of an Intel Core i7 processor 2600 with Intel HT Technology can compute Fast SHA-256 of a large data buffer at the rate of -11.5 cycles/byte.
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